Physical environment of the Indonesian Seas with focus on the western region

Mayer, Bernhard; Siegel, Herbert; Gerth, Monika; Pohlmann, Thomas; Stottmeister, Iris; Putri, Mutiara Rachmat; Setiawan, Agus

doi:10.1016/b978-0-12-815050-4.00007-9

Cited by 3 publications

(1 citation statement)

References 36 publications

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“…In this study, we used a multi-year time series of DOC concentration, DOC and DIC carbon stable isotope composition, and DOM optical analysis from coastal Southeast Asia. Southeast Asia's extensive tropical peatlands deliver around 10% of global land-ocean DOC flux (Baum et al, 2007;Huang et al, 2017;Moore et al, 2011), while the region's archipelagic geography and monsoon-driven ocean current reversal result in long water residence times on the shelf (Mayer et al, 2022), allowing the majority of tDOC to be remineralized within the shelf sea (Wit et al, 2018;Zhou et al, 2021). We used a carbon stable isotope mass balance approach to calculate both the percentage contribution of tDOC to the bulk DOC pool (tDOC%) and the proportion of tDOC that had been remineralized to DIC.…”

Section: Bixmentioning

confidence: 99%

The Validity of Optical Properties as Tracers of Terrigenous Dissolved Organic Carbon during Extensive Remineralization in Coastal Waters

Chen

Martin

Zhou

2023

Preprint

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Terrestrial dissolved organic carbon (tDOC) is significant for coastal carbon cycling, and absorbance and fluorescence spectroscopy of chromophoric and fluorescent dissolved organic matter (CDOM, FDOM) are widely used to study tDOC cycling. However, CDOM and FDOM are often amongst the more labile components of tDOC. Because few studies have compared CDOM and FDOM to measurements of both bulk tDOC concentration and tDOC remineralization, it remains unclear how accurately CDOM and FDOM actually trace tDOC in coastal waters when tDOC undergoes extensive remineralization. We collected a 4-year coastal timeseries in Southeast Asia, where tropical peatlands supply large tDOC inputs. A carbon stable isotope mass balance shows that on average 56% of tDOC was remineralized upstream of our site, while 77% of CDOM was bleached. Despite this extensive tDOC remineralization and preferential CDOM loss, optical properties could reliably quantify tDOC. CDOM spectral slope properties, such as S275–295, are exponentially related to tDOC; these are highly sensitive tDOC tracers at low, but not at high, tDOC concentrations. Other properties are linearly related to tDOC, and both specific ultraviolet absorbance (SUVA254) and DOC-normalized fluorescence intensity may be suitable to quantify tDOC over a wider range of concentrations. However, the optical properties did not show consistent changes with the extent of tDOC remineralization. Our data support the validity of CDOM and FDOM spectroscopy to trace tDOC across coastal gradients even after the majority of tDOC has been remineralized, but they also show that these measurements may not provide much information about tDOC biogeochemical processing.

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Section: Bixmentioning

confidence: 99%

The Validity of Optical Properties as Tracers of Terrigenous Dissolved Organic Carbon during Extensive Remineralization in Coastal Waters

Chen

Martin

Zhou

2023

Preprint

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From swamp to sea: Quantifying terrestrial dissolved organic carbon in a tropical shelf sea using hydrogen isotope ratios

Wahyudi,

Kaushal,

Gudasz

et al. 2024

Organic Geochemistry

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The Validity of Optical Properties as Tracers of Terrigenous Dissolved Organic Carbon During Extensive Remineralization in Coastal Waters

Chen,

Zhou,

Martin

2024

JGR Biogeosciences

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Terrestrial dissolved organic carbon (tDOC) is significant for coastal carbon cycling, and spectroscopy of chromophoric and fluorescent dissolved organic matter (CDOM, FDOM) is widely used to study tDOC cycling. However, CDOM and FDOM are often amongst the more labile components of tDOC. Because few studies have compared spectroscopy to measurements of both bulk tDOC concentration and tDOC remineralization, it remains unclear how accurately CDOM and FDOM actually trace tDOC in coastal waters when tDOC undergoes extensive remineralization. We collected a 4‐year coastal timeseries in Southeast Asia, where tropical peatlands provide a large tDOC input. A carbon stable isotope mass balance shows that on average 53% of tDOC was remineralized upstream of our site, while 74% of CDOM was bleached. Despite this extensive tDOC remineralization and preferential CDOM loss, optical properties could still reliably quantify tDOC. CDOM spectral slope properties, such as S275–295, are exponentially related to tDOC; these are highly sensitive tDOC tracers at low, but not at high, tDOC concentrations. Other properties are linearly related to tDOC, and both specific ultraviolet absorbance (SUVA254) and DOC‐normalized fluorescence intensity may be suitable to quantify tDOC over a wider range of concentrations. However, the optical properties did not show consistent changes with the extent of tDOC remineralization. Our data support the validity of CDOM and FDOM spectroscopy to trace tDOC across coastal gradients even after the majority of tDOC has been remineralized, but they also show that these measurements may not provide direct information about the degree of natural tDOC processing.

show abstract

Physical environment of the Indonesian Seas with focus on the western region

Cited by 3 publications

References 36 publications

The Validity of Optical Properties as Tracers of Terrigenous Dissolved Organic Carbon during Extensive Remineralization in Coastal Waters

The Validity of Optical Properties as Tracers of Terrigenous Dissolved Organic Carbon during Extensive Remineralization in Coastal Waters

From swamp to sea: Quantifying terrestrial dissolved organic carbon in a tropical shelf sea using hydrogen isotope ratios

The Validity of Optical Properties as Tracers of Terrigenous Dissolved Organic Carbon During Extensive Remineralization in Coastal Waters

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